1281329 has 4 divisors (see below), whose sum is σ = 1464384. Its totient is φ = 1098276.

The previous prime is 1281317. The next prime is 1281331. The reversal of 1281329 is 9231821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1281329 - 2¹² = 1277233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281298 and 1281307.

It is not an unprimeable number, because it can be changed into a prime (1281349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91517 + ... + 91530.

It is an arithmetic number, because the mean of its divisors is an integer number (366096).

2^1281329 is an apocalyptic number.

It is an amenable number.

1281329 is a deficient number, since it is larger than the sum of its proper divisors (183055).

1281329 is an equidigital number, since it uses as much as digits as its factorization.

1281329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183054.

The product of its digits is 864, while the sum is 26.

The square root of 1281329 is about 1131.9580380915. The cubic root of 1281329 is about 108.6142693848.

The spelling of 1281329 in words is "one million, two hundred eighty-one thousand, three hundred twenty-nine".